Switch



De 10, 1929.' F. R. zus/nemo` ET AL 1,739,435

SWITCH I Filed April 24, 1,928

gyvumntoz Patented Dec. 1o,` 1929 UNITED STATES PATENT OFFICE FRANK R. ZUMBRO AND FRANCIS SHENTON, OF WAYNESBORO, PENNSYLVANIA,-

TION F PENNSYLVANIA Application mea -Apn 24,

f Our lnvention relates to a quick actmg or i' snap switch adapted to be used in conjunction `with single phase split phase induction motors, or the like, and it is an object of the invention to provide a simpleand positively acting switch, all as will be hereinafter more particularly described.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,-

Figure 1 is a side elevation of a Iswitch illus- Atrating one application of'our invention,

Figure 2, a topplan view, andJ igure 3, a fragmentary end`elevation of themercury tubes. l v

In the drawings reference character 12 indicates a solenoid and 13 a pair of mercury tube'switches which are adapted to be controlled thereby. The mercury tube switches 13 are mounted on a rocker' arm 14 operating :in conjunction with an arm 15 connected with the core of the solenoid 12. The mercury tubes 13 'each has onepole, the frontl pole las shown in Figure 1, in series circuit with the starting winding and the other pole-the'rear one as shown 1n said figure in parallel or shunt circuit to the solenoid 12. We preferably use mercury tube switches each having in one end contacts 16 and 11 projecting into the tube and adapted when the tube is tilted to cause the mercurygto flow to the end of the tube in which the contacts are located and bridge the contacts. However if desired other switches may be used. l i

The rocker arm 14 which supports the mercury tubes is pivotally mounted on the base L4/and to said base is also pivoted at the same point the bifurcated end of the arm 15. The rocker arm 14 is mounted in the bifurcation in the end of the arm 15,l and is provided with an arrow head or bevel faced cam 18, and said arms are provided with opposed slots 19 in which are journaled the extremities of a roller 20. A coil s ring is disposed around the forward end'of)the bar 15 and engages the roller 20, the opposite end of the spring being adjustably held against-longitudinal movement by lock-nuts25." This construction causes the roller 20 to bear on either the l the other extreme core' is released.

SWITCH 192s. serial No. 272,497."

upper or lower face of the cam 18 and maintain the mercury tubes tilted in one extreme position for completing the circuits and in position for breaking the circuits.

In operation when the bar 15 is *moved downward under the influence of the solenoid the roller 19 will ride over the apex yof the cam 18 andthrow the rocker arm 14 upward with a snap action. When the electromagnet is not energized in order to maintain/the parts in the position shown in Figure 1 We provide f fa spring 27 which will normally hold the arts as shown, and will permit the core o the electromagnet to be attracted, but will return the parts to the position shown as soonas the It will be obvious to those skilled in` the art that various changes may be made-in our device without departing from the spirit of ourselves to what-is shown in the drawings and described in the specification, but only asset forth in the appended claims.

Having thus fully described our said invention, what we claim as newv and desireto securl by Letters Patent is: l

snap switch comprising a bar pivotally supported at one end andhaving its opposite .i

end resiliently supported and connected with the coreof an electromagnet` said bar having its pivotally mounted end bifurcated, a roller resiliently supported in ythe bifurcation of said bar, a spring engaging said roller, anA l arm pivotally mounted on the' same support .as the pivoted end of said bar and having gpper and lower cam faces'at one end e'ngagmg saidroller', a mercury tube supported on said arm and havin thereof, said roller bemg adapted to rideJ contacts at one end from one face over `the apex and onto the other cam face o'f said bar and operate- Said switch with a snap action upon the energizing or deenergizing of the electromagnet, 'substantially as set forth. .v

2. A switch comprising a horizontally 'piv oted arm, a mercury switch on said armj and breakadapted to be tilted for maki ing the circuit when the arm lsrocked on its pivot, and means for rocking said arm mo y 'l0 the invention,` and we, therefore, do not limit i 25 upont with a snap action comprising a bar pivoted concentrically with the arm, resilient means for holding said bar in a definite position, means for moving said bar against the action 5 of the resilient meanswhereby when it is released it will return to its definite position, and a connection between the arm andbar including a double faced cam on one and a spring projected member on the other for engaging the double faced cam,'whereby the sprinfr projected member will be caused to ride from one face of the cam to the other with a snap action, substantially as set forth.

3. A snap switch comprising a support, a

barl pivoted on said support, a resilient member maintaining said bar in one position, a connection between said bar and an electromagnet for moving the bar against the action of the resilient means to another position, a mercury tube switch, a pivotally supported switch carrying member provided with opposed cam faces, means on the bar for engaging said cam faces, and spring means actuatin said last mentioned means whereby e energizing and de-energizin of the electro-magnet the oscillation of the ar will cause the member engaging one of the cam p faces on the switch supporting member to rideover to the other cam face and thus operate the switch, substantially asset forth.

In witness whereof, we have hereunto set our hands at Waynesborothis 20th day of Aplrlil, A. D. nineteen hundred and twentyei t.

g A FRANK R. ZUMBRO.

FRANCIS SHENTON. 

